The scope of combining two wettability regions is to impact the droplet dynamic behaviors, manipulate the droplets’ mobility and enhance condensation heat transfer. Hydrophobic-hydrophilic hybrid patterns can promote the heat transfer, droplet-renewal frequency and enhance the droplets’ removal during condensation. With regard of condensation on hybrid surfaces, the geometry of the patterns has a significant influence on droplets departure frequency and heat transfer performance. Therefore, different patterns geometries (circle, ellipse, and diamond) have been developed on horizontal copper tubes at atmospheric pressure. All the patterns have the same size, and the same identical gap as well between the adjacent patterns. Results show that the diamond hybrid surface has the best performance compared with ellipse, circles hybrid surfaces at the same pattern area with same neighbor gap between two patterns and complete dropwise However, the circle and ellipse hybrid surfaces outperform lower performance compared to complete dropwise surface. The heat transfer rate for the diamond hybrid surface is 15% higher than complete dropwise surface when the gap is 0.5mm. This study clearly demonstrated the effect of pattern’s geometry regarding maximum condensation heat transfer rate and droplet departure frequency.
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ASME 2018 International Mechanical Engineering Congress and Exposition
November 9–15, 2018
Pittsburgh, Pennsylvania, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5212-5
PROCEEDINGS PAPER
Influence of Pattern Geometry of Hybrid Surfaces on Dropwise Condensation Heat Transfer and Droplet Dynamics
Karim Egab,
Karim Egab
University of South Carolina, Columbia, SC
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Saad K. Oudah,
Saad K. Oudah
University of South Carolina, Columbia, SC
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M. Alwazzan,
M. Alwazzan
University of South Carolina, Columbia, SC
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Jamil Khan,
Jamil Khan
University of South Carolina, Columbia, SC
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Chen Li
Chen Li
University of South Carolina, Columbia, SC
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Karim Egab
University of South Carolina, Columbia, SC
Saad K. Oudah
University of South Carolina, Columbia, SC
M. Alwazzan
University of South Carolina, Columbia, SC
Jamil Khan
University of South Carolina, Columbia, SC
Chen Li
University of South Carolina, Columbia, SC
Paper No:
IMECE2018-88571, V08BT10A011; 8 pages
Published Online:
January 15, 2019
Citation
Egab, K, Oudah, SK, Alwazzan, M, Khan, J, & Li, C. "Influence of Pattern Geometry of Hybrid Surfaces on Dropwise Condensation Heat Transfer and Droplet Dynamics." Proceedings of the ASME 2018 International Mechanical Engineering Congress and Exposition. Volume 8B: Heat Transfer and Thermal Engineering. Pittsburgh, Pennsylvania, USA. November 9–15, 2018. V08BT10A011. ASME. https://doi.org/10.1115/IMECE2018-88571
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